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SENIOR NOTES PAYABLE AND OTHER DEBT - Summary of Senior Notes Payables and Other Debt (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Debt instruments      
Document Period End Date Jun. 30, 2018    
Senior notes payable and other debt, gross $ 10,504,977   $ 11,365,633
Deferred financing costs, net (71,540)   (73,093)
Unamortized fair value adjustment (106)   12,139
Unamortized discounts (30,434)   (28,617)
Senior notes payable and other debt 10,402,897   11,276,062
Unsecured Revolving Credit Facility      
Debt instruments      
Senior notes payable and other debt, gross 302,820   535,832
Unsecured Revolving Credit Facility | Borrowings Originally Denominated in CAD      
Debt instruments      
Senior notes payable and other debt, gross 23,200   28,700
Unsecured Revolving Credit Facility | Borrowings Originally Denominated in GBP      
Debt instruments      
Senior notes payable and other debt, gross 29,600   31,100
Secured Revolving Construction Credit Facility due 2022      
Debt instruments      
Senior notes payable and other debt, gross $ 36,337   2,868
2.00% Senior Notes due 2018      
Debt instruments      
Interest rate 2.00% 2.00%  
Senior notes payable and other debt, gross $ 0   700,000
4.00% Senior Notes due 2019      
Debt instruments      
Interest rate 4.00%    
Senior notes payable and other debt, gross $ 0   600,000
3.00% Senior Notes, Series A due 2019      
Debt instruments      
Interest rate 3.00%    
Senior notes payable and other debt, gross $ 304,645   318,041
2.700% Senior Notes due 2020      
Debt instruments      
Interest rate 2.70%    
Senior notes payable and other debt, gross $ 500,000   500,000
Unsecured term loan due 2020      
Debt instruments      
Senior notes payable and other debt, gross $ 900,000   900,000
4.750% Senior Notes due 2021      
Debt instruments      
Interest rate 4.75%    
Senior notes payable and other debt, gross $ 700,000   700,000
4.25% Senior Notes due 2022      
Debt instruments      
Interest rate 4.25%    
Senior notes payable and other debt, gross $ 600,000   600,000
3.25% Senior Notes due 2022      
Debt instruments      
Interest rate 3.25%    
Senior notes payable and other debt, gross $ 500,000   500,000
3.300% Senior Notes, Series C due 2022      
Debt instruments      
Interest rate 3.30%    
Senior notes payable and other debt, gross $ 190,403   198,776
3.125% Senior Notes due 2023      
Debt instruments      
Interest rate 3.125%    
Senior notes payable and other debt, gross $ 400,000   400,000
3.100% Senior Notes due 2023      
Debt instruments      
Interest rate 3.10%    
Senior notes payable and other debt, gross $ 400,000   400,000
2.55% Senior Notes, Series D due 2023      
Debt instruments      
Interest rate 2.55%    
Senior notes payable and other debt, gross $ 209,444   218,653
3.75% Senior Notes due 2024      
Debt instruments      
Interest rate 3.75%    
Senior notes payable and other debt, gross $ 400,000   400,000
4.125% Senior Notes, Series B due 2024      
Debt instruments      
Interest rate 4.125%    
Senior notes payable and other debt, gross $ 190,404   198,776
3.500% Senior Notes due 2025      
Debt instruments      
Interest rate 3.50%    
Senior notes payable and other debt, gross $ 600,000   600,000
4.125% Senior Notes due 2026      
Debt instruments      
Interest rate 4.125%    
Senior notes payable and other debt, gross $ 500,000   500,000
3.25% Senior Notes due 2026      
Debt instruments      
Interest rate 3.25%    
Senior notes payable and other debt, gross $ 450,000   450,000
3.850% Senior Notes Due 2027      
Debt instruments      
Interest rate 3.85%    
Senior notes payable and other debt, gross $ 400,000   400,000
4.00% Senior Notes due 2028      
Debt instruments      
Interest rate 4.00% 4.00%  
Senior notes payable and other debt, gross $ 650,000 $ 650,000 0
6.90% Senior Notes due 2037      
Debt instruments      
Interest rate 6.90%    
Senior notes payable and other debt, gross $ 52,400   52,400
6.59% Senior Notes due 2038      
Debt instruments      
Interest rate 6.59%    
Senior notes payable and other debt, gross $ 22,973   22,973
5.45% Senior Notes due 2043      
Debt instruments      
Interest rate 5.45%    
Senior notes payable and other debt, gross $ 258,750   258,750
5.70% Senior Notes due 2043      
Debt instruments      
Interest rate 5.70%    
Senior notes payable and other debt, gross $ 300,000   300,000
4.375% Senior Notes due 2045      
Debt instruments      
Interest rate 4.375%    
Senior notes payable and other debt, gross $ 300,000   300,000
Mortgages Loans and Other      
Debt instruments      
Senior notes payable and other debt, gross $ 1,336,801   $ 1,308,564